Duster doors

The doors will interchange and fit. Just gotta swap it out as a whole assembly. I'm pretty sure '73 glass will only fit '73 interior window mounts/mechanisms. Hopefully the doors you are looking at are complete. Also, the interior door handles are in a different location between '70-'72 and '73-'76.

Earlier doors also do not have the "crash bar". I believe '72 may have been the first year for that. '73 & later definitely had them.